Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary of Changes in Fair Value of Level 3 Financial Liabilities (Detail)

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Fair Value Measurements - Summary of Changes in Fair Value of Level 3 Financial Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Fair Value Disclosures [Abstract]  
Warrant liability, Beginning Balance $ 214
Unrealized Loss on warrants 106
Warrant liability, Ending Balance $ 320